Where to begin...
With Mists of Pandaria (MoP) soon to be available, I’m going to start a short series of guides as to how to get from no professions, to choosing the items to sell to maximise profit.
The recommendation below is not from the perspective of a hardcore raider, but more to achieve synergy in gold making.
From the start work towards finding a level 13+ (Preferably 25) guild to join as you level your character. Keep an eye on trade chat for any guild advertising. The idea behind this is you will get a bonus to experience gain as you level (Fast Track rank 2 Guild lvl 5) plus another perk (WorkingOvertime Guild lvl 13) and (Bountiful Bags, Guild lvl 22) which will assist you in your profession levelling.
When levelling a toon I always use the free ingame addon from http://wow-pro.com/. This addon is so good I can’t give the authors enough credit.
What Professions to take?
Some people will tell you to level your professions as you level your character, I’ve found this to be more time consuming then doing it once you hit 85, with the possible exception of Gathering professions (Mining, Herbing, Skinning).
Starting out I would recommend Mining and Jewelcrafting (JC) to any new players.
Ore is required by 4 professions while Herbs are only required by 2, so even if you just farm ore you will find a bigger market in Ore. That’s not to say you’ll make more gold in ore, just that there’s more liquidity. The main reason to take JC is that Gems have a very high turnover and with gear being upgraded regularly, customers keep coming back. JC is also part of the Shuffle which feeds Enchanting. If you want to know how the Shuffle works then the diagram in the link below, will break it down. Having the professions associated with the shuffle is the foundation to the “Consortium Project”
These sites are a great resource for anybody wishing to level/change professions. They give you a detailed list of materials required to level any profession and what items to craft to quickly max it.
Once you hit 85 and have levelled your Mining & JC to 525, then I suggest you either drop mining for enchanting or preferably level it on another toon. The synergy between Mining, JC and Enchanting is “Golden”.
After this, on another toon I would take Blacksmithing. Alchemy is also a good choice because you can transmute uncommon gems into Rare Gems but it requires herbs which you’d have to purchase off the AH. It’s preferable to make friends with a Guildy who has Alchemy (Transmutation Master) as a profession and see if they’d be willing to craft Rare Gems for you for free/small fee, if not go outside your guild.
So to break it down, 2 toons with the following professions.
Toon A - Mining & JC
Toon B - Enchanting & Blacksmithting.
Now you are ready to make some serious gold.